3.5mm jack connection. does this power headphones?

I know this is probably a stupid question, but I want to buy a new pair of headphones, which as far as I know, require power to drive them properly. Does the 3.5mm audio jack on a Macbook 6,1 have power or not? not sure how the jacks work. Do they all have power, and some like a computer or laptop have more than a personal music device?

Usually headphones don't require power. They simply need to be plugged into a powered device that is outputting audio signal. They aren't equipped with an amplifier that requires any extra power source. I did have a pair of Sennheiser's that required an inline AA battery to switch between noise-cancelled and non noise-cancelled but that was just a convenience factor so you could flip a switch and have a chance of hearing a stewardess ask you if you wanted peanuts.
Which ones are you looking at?

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